Hollow-walled box



3952/ M. 1. WILLIAMSON 2,605,953

HOLLOW-WALLED BOX Filed June 19, 1951 5 Sheets-Sheei 1 IN V EN TOR.Marshall Wzi/lamsw? Q 544/ 'A TTOR/VEY g- 5, W5 M. WILLIAMSONHOLLOW-WALLED BOX 3 Sheets-Sheei 2 Filed June 19 1951 1 l l I l l I ll?Pig. 5

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INVENTOR. Marshall 1. Wz'llzamson ATTORNEY g- 5, 1952 M. 1. WILLIAMSON2,605,953

HOLLOW-WALLED BOX Filed June 19, 1951 Z: Sheets-Sheet 3 INVENTOR.Mars/rail Z Wz'l/mmsan ATTORNEY Patented Aug. 5, 1952 UNITED STATESPATENT OFFICE Marshall I. Williamson, New Haven, Conn.

Application June 19, 1951, Serial No. 232,349

This invention provides a novel and improved construction for boxes,cartons, trays, or other receptacles made from paperboard, cardboard, orother foldable sheet material, hereinafter collectively referred to forconvenience as boxes or "folding boxes.

This invention has particular reference to folding boxes having hollowwalls of substantially triangular cross-section. Such boxes aresometimes referred to as bevel-edge boxes or "bevel-edge trays.

Hollow walled boxes of the aforementioned type must meet exactingspecifications with regard to appearance and strength. The mostimportant structural detail in this connection is the construction ofthe box corners since it determines not only the neatness of appearance,but also the resistance of the box to deformation. It is very importantthat hollow walled boxes should have corner constructions which remainneatly assembled even if considerable force is exerted on the hollow boxwalls from the inside, from the outside, or from above.

Forces from the inside are generally exerted by the merchandise packagedin the box. Tight fitting merchandise, for example, exerts'quite asubstantial force against the inner panels of the box walls.

Forces from the outside are encountered if the box is tight-wrapped,orpackaged in multiple in larger boxes or cases.

Forces from above are encountered when the boxes are stacked one on topof another.

My prior Patent 2,522,325 of September 12, 1950 discloses and claims,among other details, a particularly advantageous and strong cornerconstruction for hollow walled folding boxes having walls ofsubstantially triangular crosssection. This corner constructionincludesa plurality of panels integral with the inner panel and with the outerpanel of a hollow wall, for example, a side wall, the characteristicfeature of the arrangement being, that the panel assembly whichoriginally forms a continuation of the hollow side wall can be folded toextend in a new direction, at an angle. to the direction it originallyassumed, to furnish support for a further box wall, for example, an endwall, which extends at an angle to the side wall.

This invention is concerned with certain improvements and refinements ofthe aforementioned basic corner construction. The invention provideswall constructions covering a considerable range of angles for theinside and for the outside wall panels, and a so permits box 7 Claims.(01. 229-s4 2 blanks to be pre-fol'ded and pre-glued in: such a way thatthe assembly of the box, beginning from a fiat collapsed blank, isgreatly facilitated.

These improvements are the subject matter of this and of a co-pendingapplication for Letters Patent, Serial No. 232,350, filed June 1 9,1951. This application for Letters Patent is more particularlydirectedto hollow walled folding boxes of the aforementioned type in which themain, or bottom, panel is of single ply thickness. It is also directedto the feature of pregluing certain portions of the blank in such a waythat erection of two opposite wall structures automatically causes theother two wall structures to assume their final shape and position. 7

My co-pending application, Serial No. 232,350 is directed to boxes inwhich the main panel, or bottom, is of double thickness. In the lattertype of box all exposed surfaces of the box are formed by the samesurface of the board permitting use of board which is imprinted,decoratively finished, or otherwise surface treated on one side only. v

Regardless whether a single-ply bottom construction or ado'uble-plybottom construction is used, there is a large choice of' angles. Theinside wall panels, as well as the outside wall panels, may have a slopeof degrees with respect to the main panel. The inside walls may form anangle of degreeswith respect to the main panel and the outside walls mayslope at.

an angle of 45 degrees or 60 degrees, as may be required by theparticular packaging job. The boxes may be shallow or they may be deep.The angles of the side walls may differ from the angles of the endwalls, and the angles "in general, may be of other magnitudes thanhereinbefore stated, the previously given figures being most commonlycalled for in the'trade.

These and various other objects, features and advantages of theinvention will appear more fully from the detailed description whichfollows, accompanied by drawings showing, for the purpose ofillustration, a representative embodiment of the invention. Theinvention also .con-

sists in certain new and original features of construction andcombination of elements hereinafter set forth and claimed.

Although the characteristic features of this invention which arebelieved to be novel will be particularly pointed out in the claimsappended hereto, the invention itself, its objects and advantages, andthe manner in whichit may be fiarried out, may be better understood byre- Figure 4 is a perspective view of the blank of V Figure 3 in theprocess of expansion into hollow box form;

Figure 5 is a perspective view of the. com

pleted box; and

Figure 6 is an end view, partly in section, of' the box of Figure 5, asection being taken on plane 6-56 of Figure 5, .the inner end wall tothe outer end wall panel along oblique flap fold lines 42 and 43extending at an angle with respect to the outer end fold line l4. Afurther pair of side flaps 44 and is articulated to the outer end wallpanel 3| along oblique flap fold lines 45 and 41, respectively.

The provision of the side flaps 40, 4|, 44 and 45 is optional. However,as will later become apparent, the side flaps, besides performing astructural function, result in neater appearance, since no out edges areexposed at the corners of the box if the aforementioned side flaps areemployed.

The corner structure of the blank includes at least two panel portionsbordered by at least threecorner fold lines aimed at a common point ofintersection on the side ridge fold lines. In

being-shown upright, before folding and tucking in.

In the following description and in the claims, various details will beidentified by specific names for convenience. These names, however, areintended to be as generic in their application as the art will permit.Corresponding reference characters refer to corresponding parts in theseveral figures of the drawings.

In the drawings accompanying, and forming part of, this specification,certain specific disclosure of the'invention is made for the purpose ofexplanation of broader aspects of the invention, but it is understoodthat details may be modified in various respects without departure fromthe principles of the invention and that the invention may be applied toother structures than the one shown.

Referring to the drawings, the blank A in Figure 1 may be cut and scoredin multiple from rolls or sheets of paperboard, cardboard, or otherflexible sheet material. Only one side of the board need be imprinted orotherwise decoratively finished, since only one side of the blank isexposed to view, except for the inner bottom surface. In Figure 1 theblank is shown in the position in whichthe unfinished surface faces theobserver.

The blank is subdivided into panels and flaps by a plurality of scorelines. A main panel H is bordered by outer side fold lines l2 and I3 andouter end fold lines l4 and I5. These fold lines intersect at thecorners l6, |1, l8 and I9 of the main panel which, as will later beseen, be

come the outer corners of the box.

Outer side wall panels 29 and 2| are articulated to the main panel alongthe outer side fold lines l2 and I3, respectively. Inner side wallpanels 22 and 23 are articulated to the outer side wall panels alongside ridge fold lines 24 and 25. Inner bottom flaps 26 and 21 arearticulated to the inner side wall panels 22 and 23 along inner sidefold lines 28 and 29, respectively.

In a similar manner outer end wall panels 39 and 3| are articulated tothe main panel along the outer end fold lines [4 and I5, respectively.Inner end wall panels 32 and 33 are articulated to the'outer end wallpanels along end ridge fold linesv 34 and 35, respectively. Tuck flaps36 and'3l are articulated to the inner end wall panels 32 and 33 alonginner end fold lines 38 and 39, respectively.

A pair of side flaps 49 and 4| are articulated the illustrated form ofblank substantially triangular panel portions 48 and 49 are articulatedto the inner side wall panel 22 along corner fold lines 50 and 5|,respectively. These fold lines intersect the side ridge fold line 24 at52 and 53. A further pair of substantially triangular panel portions 54and 55 is articulated to the outer side wall panel 20 along corner foldlines 56 and 51, respectively. It will be noted that these corner foldlines 56 and 51 are also aimed at the points of intersection 52 and 53,respectively. The panel portions 54 and 55 are further bordered bycorner fold lines 58 and 59 towards the panel portions 48 and 49,respectively. The corner fold lines 58 and 59 are also aimed at thepoints 52 and 53, respectively.

Securing flaps 59 and 6| are articulated to the panel portions 54 and 55along flap fold lines 62 and 63, respectively. These securing flapsperform. their function in a variety of ways, as will later be seen.They may be adhesively secured to other portions of the blank or theymay be caused to abut one or more fold lines of the blank with theirouter edges, such abutment edges being 64 and 65 on the securing flap90, and edges 56 and 61 on the securing flap 6|.

In a similar. manner substantially triangular panel portions 68 and 69are articulated to the inner side wall panel 2| along corner fold linesH1 and II, respectively. These fold lines intersect the side ridge foldlines 25 at 12 and 13, respectively. A further pair of substantiallytriangular panel portions 14 and I5 is articulated to the outer sidewall panel 2| along corner fold lines 15 and 17, respectively. It willbe-noted that these corner fold lines 16 and 11 are also aimed at thepoints of intersection l2 and 13, respectively. The panel portions 14and 15 are further bordered by corner fold lines I8 and 19 towards thepanel portions 58 and 69, respectively. The corner fold lines 18 and 19are also aimed at the points 12 and 13, respectively.

Securing'flaps 89 and BI are articulated to the panel portions 14 and 15along fiap fold lines 82 and 93, respectively. These securing fiaps and8| have abutment edges 84, 95, and 86, 81, respectively.

The side flaps 40, 4|, 44, and 45 have cut bordering edges 88, 89, 90,9|, 92, 93, 94 and 95, respectively, which are so disposed that the cutedges abut certain fold. lines of other panels in the assembled box.

For the purpose of more convenient assembly, it may be desirable to formcertain lines of articulation as interrupted cut scores rather thanplain scores to reduce the resistance of the board to folding. Such cutscores are indicated in the drawings by dash double-dot lines and arefound,

for example, at 50, 5|, 70-. II, at 62, 63,. and at 82,83.

The assembly of the blank A shown in Figure 1 into box form may proceedas follows:

In the event the securing flaps are to be adhesively secured, adhesive ais first applied to the securing flaps 50, 6|, 80 and 8|. However, aspreviously indicated, the gluing of these flaps is optional and there isno material difference in strength or rigidity of the finished box,whether the securing flaps are glued or not. However, gluing of thesecuring flaps facilitates the erection of the boxes as will laterbecome apparent.

As a first folding operation, the inner bottom flaps 23 and 21 arefolded upon the inner side wall panels 22 and 23 along the inner sidefold lines 28 and 29, respectively.

The side wall assemblies are then folded over the inside surface of themain panel along the outer side fold lines l2 and I3, respectively. Theaforedescribed folding operations produce what is called in the art acompound fold and bring the securing fiaps 60, GI, 80 and 8| intooverlying position with respect to the outer end wall panels 3|] and 3|.If adhesive is employed, the securing flaps 60 and 80 are adhesivelysecured to the outer end wall panel 30, and-the securing flaps 6| and 8|are adhesively secured to the outer end wall panel 3|.

Even if no adhesive is employed, it becomes apparent that in the foldedcondition the abutment edges 84 and 84 are in substantial registry withthe flap fold lines 42 and 43. Similarly, the abutment edges 66 and 86are in substantial registry with the flap fold lines 46 and 41. Also,the abutment edges 65 and 85 are in substantial registry with the endridge fold line 34 and the abutment edges 98 and 81 are in substantialregistry with end ridge fold line 35.

Figure 2 illustrates the box blank in folded condition, the blank beingdesignated as A.

Next, the side flaps 4|], 4|, 44 and 45 are folded over the respectivesecuring flaps 6U, 80, BI, and 8|, respectively. After performance ofthis last described folding operation, the blank has the appearance asshown in Figure 3, the condition of the blank being designated as A". Itwill be noted that the abutment edges 88and 99 of the side flaps 48 and4| lie in substantial coincidence with the abutment edges 65 and 85, andalso with the end ridge fold line 34. The abutment edges 89 and 9| arein substantial coincidence with the corner fold lines 62 and 82.

At the other end of the box, the abutment edges 92 and 94 f the sideflaps 44 and 45 are in substantial coincidence with the abutment edges61 and 86 and with the end ridge fold line 35. The abutment edges 93 and95 of the side fiaps 44 and 45 are in substantial coincidence with thecorner fold lines 63 and 83, respectively.

The blank A" may be shipped and stored in fiat collapsed condition andrequires a minimum of space for shipping and storing. It may easily beset up into hollow box form by a simple operation which is illustratedin Figure 4 and which will now be described.

In order to erect the box, the end wall assemblies are folded at thefold linesl4 and I with respect to the main panel I This foldingoperation causes the side walls to assume hollow triangularcross-sectional shape, the edges 28 and 29 receding towards the sideedges l2 and I3 of the box. The movement of the edges 28 and 29 isindicated by the arrows 98 and 91 and is aresult of the folding of thetriangular panel portions at the box corners. It is seen that the blankcreases at the fold lines 62, 82, 63 and 83, as wellas at the cornerfold lines 50, 5|, l0 and II, respectively. In order to reduce theresistance of the board to foldingat these fold lines, the board isinterruptedly cut-scored, as hereinbefore mentioned. r

The points of inter-section 52, 53, I2 and 13 rise as peaks andform'four ridge corners. The panel portions 54, 55, 14 and 15 form endsurfaces over which the outer end wall panels 30 and 3| are foldable andagainst which the end panels rest together with the flaps 40, 6|], 4|,8B and the flaps, 44, 6| and 45,8l', which are folded over the outer endwallpanel 30 and 3|, .respectively.

When the folding of the outer end wall panels 30 and 3| is completed,the end ridge fold lines 34 and-35 extend between thepeaks 52, I2 and53, 13, respectively. p

In order to complete the setting up of the box it is only necessary tofold the'inner end wall panels 32 and 33 into their required positionwith respect to the main panel I and to tuck the tuck fiaps 36 and 3'linto the interior space of the hollow end wall structures thus formed.The tuck flaps have a frictional engagement, points 98 and 99 being suchpoints of frictional engagement for the flap 36 in Figure 6. r I

The resulting box is of extraordinary strength and is greatly resistantto forces exerted on it from the inside, from the outside and fromabove. The. box has also extraordinary resistance to twisting. Thestrength of the box is due mainly to the unique corner constructionformed by the aforementioned panel portions having bordering fold linesaimed at common points of intersections. The strength of the cornerassembly, particularly its resistance to outwardly directed force, isenhanced by the aforementioned abutment between the various abutmentedges and the fold lines with which the abutment edges lie in registry.

It is a particular feature of the hereinbefore described box form thatthe securing flaps 60, 80, 6| and 8| may be preglued, thus facilitatingthe erection of the box. v

If the securing flaps are not glued, the strength of the box is hardlyaffected. However, the erection of the box may require a slight outwardpressure in the direction of the arrows 96 and 91 against the edges 28and 29 in order to cause the side walls to assume-hollow triangularshape. The strength of the unglued box is practically equal to thestrength of the glued box since the edgeto-fold line abutment betweenthe various cut edges and fold lines at each corner imparts a greatamount of strength and rigidity to the box corners.

Obviously the present invention is not restricted to the particular formof box herein described, but may be incorporated in other forms of boxeswith equal benefits. Thus, various additions, omissions, modifications,substitutions, and other changes may be made without departing from thespirit of the invention.

What is claimed is:

1. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom panel, each of said side wall structures comprising, an outersidewallpanelarticulated to said bottom panel along an outer side foldline, an inner side wall panel articulated to said outer side wall panelalong a side ridge fold line, and an inner bottom portion articulated tosaid inner 7 side mu Ipa'nel along" an inner .side L'fold line; said.end wall structure comprising, an outer end wall panel articulated tosaidlbottom panel along an outer end .foldline, an inner end panelarticulated'to said outer end'panel along an endridge fold line, and aflap articulated to said inner end panel along an inner end fold line; acorner structure comprising at least two panel-"portions bordered byatleast three corner fold lines aimed at a common point or intersection onsaid side ridge fold line, one of-said corner fold lines articulatingone of said panel portions to said outside wall panel, another of .saidcorner fold lines articulating "another o'f saidpanel portions to saidinside wall panel, a third corner fold line articulating one panelportion to another panel portion, said one corner fold line forming anangle of less than 1'80.degrees with said other corner fold line, theapex of the angle being said common point which by reason of thisangularity lies inwardly of the box with respect to the imaginaryextension of the outer end fold line; and a flap articulated to saidone'panel portion, said flap underlying said outer end wall panel in boxassembled position in which said flap is also folded back upon said onepanel portion.

2. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom paneleach of said side wall structures comprising, an outer sidewall panel articulated to said bottom panel along an outer side foldline, an innerside wall panel articulated to said outer side wall panelalong a side ridge fold line and an inner bottom flap articulated tosaid inner side wall panel along an inner side fold line; said end wallstructure comprising, an outer end wall panel articulated to said bottompanel along an outer end fold line, an inner end panel articulated tosaid outer end panel along an end ridge fold line, and an end flaparticulated to said inner end panel along an inner end fold line; acorner structure comprising at leasttwo panel portions bordered by atleast'three corner fold lines aimed at a common point of intersectiononsaid side ridge fold line, one Of said corner fold linesarticulatingoneof said panel portions to said outsidewall panel,anotherof saidcorner fold lines articulating another of sa-id panelportions to said inside wall panel, a third corner fold linearticulating one panel portion to another panel portion, said one cornerfold line forming an angle of less than 180 degrees Withsaid othercorner fold line, the apex of the angle being said common point which byreason of this-angu'larity lies inwardly of the box with respect to theimaginary extension'of the outer end fold line; and a securing flaparticulated to said one panel portion along a flap fold :line, said flapfold line being aimed at the adjacent bottom panel corner, the securingflap being adhesiyely secured to the inside surface of the outer endwall panel; thereby strengthening the side wall structure againstoutward pressure and causing the side walls automatically to assume'set'lup position when the end wall panels are folded." v

3. A hollow-walled folding .lbox comprising, a bottom panel; .:side wallstructures, and at least one end wall structurearticulated to saidbottom panel, eac-hof said .side wall structurescomprising, an outersidewallpanel'articulated to said bottom'panel along an QuterJside foldline, an inner side wall panel articulated to said outer side wall panelalong a side ridgetfold line and aninner bcttomjflap articulated to saidinner sidewall panel along anin'ner side fold line; said end wallstructure comprising, an outer end wall panel articulated to said bottompanel along .an outer end fold line, :an inner end panel articulated tosaid outer end panel along an end ridge fold line, and an end flaparticulated to said inner end'panel along an inner end fold line; acorner structure comprising at least two panel portions bordered by atleast'three corner fold lines aimed at a common point of intersection onsaid side ridge fold line, one of said corner fold'lines articulatingone of said panel portions to said outside wall panel, another of saidcorner fold lines articulating another of said panel portions to saidinside wall panel, a third corner fold line articulating one panelportion to another panel portion, said one corner fold line forming anangle of less than degrees with said other corner fold line, the apex ofthe angle being said common point which by reason of this angularitylies inwardly of the box with respect to the imaginary extension of theouter end fold lines; and a securing flap articulated to said one panelportion along a flap fold line, said flap fold line being aimed at theadjacent bottom panel corner, the said securing flap having an end edgeabutting said end ridge fold line in box assembled position in whichsaid securing flap is folded back with respect to said one panelportion, thereby reinforcing the box corner against outwardly directedforce acting on the walls.

.4. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom panel, each of said side wall structures comprising, an outerside wall panel articulated to said bottom panel along an outer sidefold line, an inner side wall panel articulated to said outer side wallpanel along a side ridge fold line and an inner bottom flap articulatedto said inner side wall panel along an inner side fold line; said endwall structure comprising, an outer end wall panel articulated to saidbottom panel along an outer end fold line, an inner end panelarticulated to said outer end panel along an end ridge fold line, and anend flap articulated to said inner end panel along an inner end foldline; a corner structure comprising at least two panel portions borderedby at least three corner fold lines aimed at a common point ofintersection on said side ridge fold line, one of said corner fold linesarticulating one of said panel portions to said outside wall panel,another of said corner fold lines articulating another of said panelportions to said inside wall panel, a third corner fold linearticulating one panel portion to another panel portion, said one cornerfold line forming an angle of less than 18.0 degrees with said othercorner fold line, the apex of the angle being said common point which byreason of this angularity lies inwardly of the box with respect to theimaginary extension of the outer end fold line; a securing flaparticulated to said one panel portion along a flap fold line, said flapfold line being aimed at the adjacent bottom panel corner; and a sideflap articulated to the outer end wall panel along a fold line alsoaimed at said bottom panel corner, and obliquewit-h respect to saidouter end fold line.

"5. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom panel, each of said side wall structures comprising, an outerside wall panel articulated to said bottom'panel along an outer sidefold line, an

inner side wall panel articulated to said outer side wall panel along aside ridge fold line and an inner bottom flap articulated to said innerside wall panel along an inner side fold line; said end wall structurecomprising, an outer end wall panel articulated to said bottom panelalong an outer end fold line, an inner end panel articulated to saidouter end panel along an end ridge fold line, and an end flaparticulated to said inner end panel along an inner end fold line; acorner structure comprising at least two panel portions bordered by atleast three corner fold lines aimed at a common point of intersection onsaid side ridge fold line, one of said corner fold lines articulatingone of said panel portions to said outside wall panel, another of saidcorner fold lines articulating another of said panel portions to saidinside wall panel, a third corner fold line articulating one panelportion to another panel portion; a securing flap articulated to saidone panel portion along a flap fold line, said flap fold line beingaimed at the adjacent bottom panel corner; and a side flap articulatedto the outer end wall panel along a fold line also aimed at said bottompanel corner, and oblique with respect to said outer end fold line, saidsecuring flap having a side edge abutting said side flap fold line inbox assembled position in which said securing flap is folded back withrespect to said one panel portion.

6. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom panel, each of said side Wall structures comprising, an outerside wall panel articulated to said bottom panel along an outer sidefold line, an

inner side wall panel articulated to said outer side wall panel along aside ridge fold line and an inner bottom flap articulated to said innerside Wall panel along an inner side fold line; said end wall structurecomprising, an outer end wall panel articulated to said bottom panelalong an outer end fold line, an inner end panel articulated to saidouter end panel along an end ridge fold line, and an end flaparticulatedto said inner end panel along an inner end fold line; a corner structurecomprising at least two panel portions bordered by at least three cornerfold lines aimed at a common point of intersection on said side ridgefold line, one of said corner fold lines articulating one of said panelportions to said outside Wall panel, another of said corner fold linesarticulating another of said panel portions to said inside wall panel, athird corner fold line articulating one panel portion to another panelportion, said one corner fold line forming an angle of less than 180degrees with said other corner fold line, the apex of the angle beingsaid common point which by reason of this angularity lies inwardly ofthe box with respect to the imaginary extension of the outer end foldline; a securing flap articulated to said one panel portion along a flapfold line, said flap fold line being aimed at the adjacent bottom panelcorner; and a side flap articulated to the outer end wall panel along afold line also aimed at said bottom panel corner, and oblique withrespect to said outer end fold line said securing flap being adhesivelysecured to the inside surface of the outer end wall panel.

. 7. A hollow-walled folding box comprising, a bottom panel; side wallstructures, and at least one end wall structure articulated to saidbottom panel, each of said side wall structures comprisingflan outerside wall panel articulated to said bottom panel along an outer sidefold line, an inner side wall panel articulated to said outer side wallpanel along a side ridge fold line and an inner bottom flap articulatedto said inner side wall panel along an inner side fold line; said endwall structure comprising, an outer end Wall ticulating one of saidpanel portions to said out-- side wall panel, another'of said cornerfold lines articulating another of said panel portions to said insidewall panel, a third corner fold line articulating one panel portion toanother panel portion, said one corner fold line forming an angle ofless than 180 degrees with said other corner fold line, the apex of theangle being said common point which by reason of this angularity liesinwardly of the box with respect to the imaginary extension of the outerend fold line; a securing flap articulated to said one panel portionalong a flap fold line, said flap fold line being aimed at the adjacentbottom panel corner; and a side flap articulated to the outer end wallpanel along a fold line also aimed at said bottom panel corner, andoblique with respect to said outer end fold line, said side fiap havingan edge also aimed at said bottom panel corner, said edge being insubstantial coincidence with the flap foldline of said securing flapwhen said side flap rests between said securing flap and said one panelportion in box assembled position.

MARSHALL I. WILLIAMSON.

'REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

